--- old/src/hotspot/share/gc/z/zHeap.cpp	2020-08-11 10:12:15.562077612 +0800
+++ new/src/hotspot/share/gc/z/zHeap.cpp	2020-08-11 10:12:15.394078509 +0800
@@ -35,6 +35,7 @@
 #include "gc/z/zRelocationSetSelector.inline.hpp"
 #include "gc/z/zResurrection.hpp"
 #include "gc/z/zStat.hpp"
+#include "gc/z/zTask.hpp"
 #include "gc/z/zThread.inline.hpp"
 #include "gc/z/zVerify.hpp"
 #include "gc/z/zWorkers.inline.hpp"
@@ -185,6 +186,26 @@
   _workers.threads_do(tc);
 }
 
+// Adapter class from AbstractGangTask to Ztask
+class ZAbstractGangTaskAdapter : public ZTask {
+private:
+  AbstractGangTask* _task;
+
+public:
+  ZAbstractGangTaskAdapter(AbstractGangTask* task) :
+      ZTask(task->name()),
+      _task(task) { }
+
+  virtual void work() {
+    _task->work(ZThread::worker_id());
+  }
+};
+
+void ZHeap::run_task(AbstractGangTask* task) {
+  ZAbstractGangTaskAdapter ztask(task);
+  _workers.run_parallel(&ztask);
+}
+
 void ZHeap::out_of_memory() {
   ResourceMark rm;